Figure 6 Popliteal cyst: (A) A significant cyst is seen in the posterior popliteal fossa. (B) MRI T2-weighted image shows a homogeneous high signal mass in the posterior part of the popliteal fossa. (C) Horizontal MRI shows that the popliteal cyst is located between the medial head of the gastrocnemius muscle and the semimembranosus muscle. (D–F) Schematic diagram of location of popliteal cysts, anatomical structures and horizontal planes.